铝酸钠溶液碳酸化分解的热力学  

Thermodynamics of carbonization of aluminate solution

作　　者：李小斌[1] 刘祥民[1] 苟中入[1] 彭志宏[1] 刘桂华[1] 周秋生[1] 丁安平[2] 李明[2] 刘业翔[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083 [2]中国铝业股份有限公司山西分公司,河津043300

出　　处：《中国有色金属学报》2003年第4期1005-1010,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展规划资助项目(G1999064910)

摘　　要：为对高浓度铝酸钠溶液碳酸化分解过程中产品杂质含量的控制提供理论依据,分析了铝酸钠溶液碳酸化分解过程的热力学,认为该过程中Al(OH)3析出的真正机理是过饱和铝酸钠溶液的自发结晶;而基于分解过程中平衡浓度的热力学计算表明,在碳酸化分解过程中SiO2的变化规律与公认的三段变化规律一致,说明该过程产品中SiO2的含量取决于它在溶液中的平衡浓度,而非吸附所致;同时还分析了丝钠铝石的形成热力学。The mechanism of carbonization process of aluminate solution was analyzed thermodynamically. The results show that the internal reason of precipitation of Al(OH)3 in the process is its spontaneous nucleation caused by supersaturation of aluminate solution. The behaviors of SiO2 in the process are in accordance with that from published experiment, which implies that the content of product SiO2 from carbonization depends on its solubility but is not the result of absorption. The thermodynamic calculation for forming Na2O·Al2O3·2CO2·nH2O was achieved.

关 键 词：铝酸钠溶液 碳酸化分解 热力学 结晶 氧化铝 

分 类 号：TF821[冶金工程—有色金属冶金]